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首页> 外文期刊>Marine Geodesy >Detection of Rain/Cloud Pixels by Ka-band AltiKa Altimeter over the Tropical Region: Development of a Rain/Cloud Flag Algorithm and its Validation
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Detection of Rain/Cloud Pixels by Ka-band AltiKa Altimeter over the Tropical Region: Development of a Rain/Cloud Flag Algorithm and its Validation

机译:利用Ka波段AltiKa高度计探测热带地区的雨/云像素:雨/云标志算法的发展及其验证

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摘要

A rain/cloud flagging algorithm for the AltiKa waveform is developed. For this purpose, Mean Power Count between 13 and 40 gates. MPC13-40/ and absolute value of off-nadir angle zeta j z 2 j ) of Altika waveform are utilized against the backdrop of Liquid Water Content ( LWC) > 0.25 kg m- 2. It is observed that MPC13- 40 parameter is also affected by strong low- level jet. During the validation phase at near simultaneous time scale with 3B42 rainfall over the Indian Ocean, Probability of Detection ( POD) and False Alarm Ratio ( FAR) of Flag 1 ( for LWC > 0.25 kg m- 2) are found to be 0.76 and 0.19, respectively. Similarly POD and FAR of Flag 0 ( for LWC <= 0.25 kg m- 2) are found to be 0.90 and 0.11, respectively. Over the tropics during March 2013 to February 2014, the developed algorithm has detected 6.88% of Flag 1, of which 4.41% are due to rain/cloud, and the remaining 2.48% of flags are primarily due to strong low- level jet. Overall correlation coefficient between occurrence of Flag 1 due to rain/cloud and 3B42 rainfall is found to be 0.76. The developed algorithm is reasonably robust for detecting rain/cloud pixels.
机译:开发了AltiKa波形的雨/云标记算法。为此,平均功率在13至40门之间计数。在液态水含量(LWC)> 0.25 kg m-2的背景下,利用了Altika波形的MPC13-40 /和离天底角的绝对值zeta jz 2 j的绝对值。观察到MPC13-40参数也受到影响通过强力的低空喷射。在验证阶段,在印度洋上同时出现3B42降雨的同时时间尺度上,标志1(LWC> 0.25 kg m-2)的探测概率(POD)和虚警率(FAR)分别为0.76和0.19。 , 分别。类似地,发现标记0的POD和FAR(对于LWC <= 0.25kg m-2)分别为0.90和0.11。在2013年3月至2014年2月的热带地区,开发的算法已检测到6.88%的1号旗,其中4.41%是由于雨/云,其余2.48%的旗主要是由于强低空急流。发现由于降雨/云而导致的1号旗的发生与3B42降雨之间的总体相关系数为0.76。所开发的算法在检测雨/云像素方面相当强大。

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